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Southern Hemisphere midlatitude atmospheric variability of the NCEP-NCAR and ECMWF reanalyses

TitleSouthern Hemisphere midlatitude atmospheric variability of the NCEP-NCAR and ECMWF reanalyses
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2007
AuthorsDell'Aquila, Alessandro, Ruti P.M., Calmanti Sandro, and Lucarini V.
JournalJournal of Geophysical Research Atmospheres
Volume112
ISSN01480227
KeywordsAtmospheric movements, atmospheric wave, climate modeling, Climatology, Computer simulation, data assimilation, midlatitude environment, Oceanography, Satellite data, Southern Hemisphere, spatial variation, spectral analysis, temporal variation
Abstract

We compare the representation of the Southern Hemisphere midlatitude winter variability in the NCEP-NCAR and ERA40 reanalyses by using the Hayashi spectral technique. We find important discrepancies in the description of the atmospheric waves at different spatial and temporal scales. ERA40 is generally characterized by a larger variance, especially in the high-frequency spectral region. Compared to the Northern Hemisphere, the assimilated data are relatively scarce particularly over the oceans, and they provide a weak constraint to the assimilation system even in the period when satellite data are available. In the presatellite period the discrepancies between the two reanalyses are large and randomly distributed; after 1979 the discrepancies are systematic. This study suggests that, as for the winter midlatitude variability in the Southern Hemisphere, a well-defined picture to be used in the evaluation of climate model simulations is still lacking because of the nonconsistency of the reanalyses. Copyright 2007 by the American Geophysical Union.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-34250626091&doi=10.1029%2f2006JD007376&partnerID=40&md5=8dccdea2434c916d6f340ba086df6d63
DOI10.1029/2006JD007376
Citation KeyDell'Aquila2007